Vibration analysis of a large underwater shell of revolution

Y. Yasuzawa, K. Kagawa, H. Takahashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


This is the 2nd report on structural feasibility study of an underwater half drop shaped shell, the 1st one was reported in ISOPE'93. Dynamic characteristics of a large underwater shell of revolution are studied iii the paper. Large rotational shell having optimum shape with respect to the hydrostatic pressure can be used for a storage of LNG or vessel of super conducting coil for power storage in the future. In this study, which is one of many structural feasibility studies for the shell, vibration characteristics of the shell are examined using numerical analysis, in which finite elements for the structure and boundary elements for surrounding water are used. Natural frequencies and modes of an underwater drop shaped shell are examined using a developed numerical code "DASOR." The code was justified by comparison with other results of vibration analysis of a submerged cylindrical shell for various water levels. The added mass effect of the underwater drop shaped shell in each vibration mode is discussed and the ratio of modal mass of structure in water and in air in the lowest mode proved to be very large specially for axisymmetrical mode and horizontal lowest mode. A seismic response analysis of the underwater shell of revolution with the excitation coming from a horizontally moving seabed is performed numerically and statistically. The analysis using power spectrum density function provide with the responses of distribution of displacements, membrane stresses, and bending moments.

Original languageEnglish
Title of host publication5th International Offshore and Polar Engineering Conference, ISOPE 1995
PublisherInternational Society of Offshore and Polar Engineers
Number of pages8
ISBN (Print)1880653168
Publication statusPublished - 1995
Event5th International Offshore and Polar Engineering Conference, ISOPE 1995 - The Hague, Netherlands
Duration: Jun 11 1995Jun 16 1995

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792


Other5th International Offshore and Polar Engineering Conference, ISOPE 1995
CityThe Hague

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering


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